v850_register_names, v850_processor_type_table): Declare tables
and structures for handling differences in register names for
v850 and v850e.
(struct reg_list): Define new structure for creating tables
of register bit masks in v850e instrutions.
(handle_prepare, handle_pushm): New helpers for v850_scan_prologue.
(v850_scan_prologue): Recognize v850e instructions: callt, prepare,
and pushm.
(v850_target_architecture_hook): New function to set register
names based on current machine.
(_initialize_v850_tdep): Set up target_architecture_hook.
* config/v850/tm-v850.h (v850_register_names): Declare.
(REGISTER_NAME): Define to refer to v850_register_names.
(SR0_REGNUM, CTBP_REGNUM): Define.
(PS_REGNUM): Redefine in terms of SR0_REGNUM.
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